Pangborn



TO allwhommayooncm: k w :y y v "Be` it known that`lI`,` ZADocPANGBoRN, of

Algonac, in the countyfoSinclair and State of Michigan, "have invented` an Iinprovel ment@ in Construction of `'Vessels to Prevent l ingis a full,1 clear,` andlexact description of ,lthe principle or `character which distin- 1f` gushes `it from fallQo-therl `things before gknownand ofthe usualfrnanner of making,

cmodifying, and usingythe same7 reference Qbeing; had to the` accompanying drawings,` of

igure lis" a planofwthe" traine work of the boatshowing a top view of the `air cham- ""hers.` Fig."2,fis a side :elevation of the same. lyFilg. 3,:isa cross section `through the line 2 showing one ofthe ribs of the vessel;

i rate tanks'withfthe "ends left open.

" "My inventionconsists in" a` certain con.- I"struction of the hullslof vessels whereby I `provide the means of preventing them from sinkingV inf the `event 1of accidents from `ex#` jplosion,` lire;` storm, collision, snags,` reefs or w tothe strength of they` vessels hull. I am w aware that tanks have `heen used in `various r `ways for buoyingyup" boats and i vessels and I do not lay clairnto such devices except `under` w the arrangement` and construction `1 herein set forth: lEaChih of the hull a, a, f ""etc., bifureated `ory'continuedpin two parts to a ,suflicient height above the lower deck;`

"an" angular or p somewhat `lozenge` shaped spaceb b and these spaces increasing in size andheighttoward midships fore and aft,

" Them .From sinking, @and that the follow:

" 1 "Fig,` 4E is a detached View Y showing the `sepa- "anyother cause and at lthe Sametime adding `"theseparts:joining atthev top so asto leave Witnesses soasj to forrn anarchc` o which ygives great d NITEDSTATES PATENTOFFCE.

" specificati@ pf Leiters raient No; 12,445, dated Februay 27, `1855.

i Il w strength lto the hull, beinga security against hogg1ng, stitfening the boat and making it less liable to injury romcollision. 4These spaces b may have the cross ties d, d, in

part of them or in all, and the whole when properly sheathed will form bouyant air vessels of great capacity. In order howeverto guard `against llire which would destroytheni, I make the inner lining of these Y w vessel may be scut-tled fore and aft or both 1 as the case may be and the fire checked and the vessel still floating may be pumped out andrecovered.V In order to render this device more safe in the event of damage to any partA of the vessel I divide the inner metal tanks so as to have separate compartvments as shown inFig. Ll--at e, e. In the case of arrnedy Vessels the requisite-number of port vholes must be left and owing to `the greater depth required in this structure for port holes, they must be made flaring either inward or outward as the case may be.

`The `sheathing may he of iron or Wood whicheverinay loe thought leest. w

What I claim as myinvention is`-' i The arrangement of tanks constructed as `above ,set forththe same consisting in the extension and bifurcation'of the ribs of vessels hulls so as to `:torrn an arched series of tanks or receptacles for tanks in the Inan- SAML. GRUBB, O. CAMPBELL. 

